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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc219a9653d4536c5b15772745ed85d0fbad11e0d6cc3de2931c10f427bcd897' 
  AND token = 'U4tB+UuKo1CgwCtWBc0fur5UJA5f91LX85vLNTjJlPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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