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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07070d4bad185e81d3f81f73594d4b818f8fee572fb55311f4bc70d3a80f19d6' 
  AND token = 'nXIDl1oT0e4bh6pGjBxP8Ktfy9g65XMkZ5W1Ue9OY7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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