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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e183407658e5c06d4efd0409f50a7306ff9769780bc2398bdb6d6a22c14a68f0' 
  AND token = 'OqbroK8q9rhJz1NLAh/Ix9/RL2FAiVHD4Kq76QIwTo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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