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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcc9b2710ebed16abd8b5e506820ecfcd8bd3121de3a446776ed1483b67ab89' 
  AND token = 'KP2ZsaKatlomEX7jGP5i4Z8zsQvv9Amf4+gJoFEC5dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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