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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14984a750cee53bdf032f368d9122b84c7a691c257c56b6587bd3930362f37c9' 
  AND token = '2CSugyqTSnNGZ5Qn1Cc6wrbMfPEbXf28Ltz9T4KoLyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}