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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93450bc64d62ffcf37966aad26750b96cb1f1f208f4ff857b3f11a0a896cb87' 
  AND token = 'D2EZVdAvSMBUj1KLucese1xu2RwaogI5Zzp36ZUEmI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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