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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ada7f6e8ab424287737ff01aa3944a1c9864dee23e6c6ee28ddbf5a0c5a994' 
  AND token = '4Ks/E/EajDhUfy5zppy4iFIbjLxQpLsbc/859ZW13JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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