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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cfd275d0c12350a3aa25f88e41ef4e0cf5ed43397f9d912fe14bcebf15b626' 
  AND token = 'psrp6JYy9mDXAMP73tsYFp0snyvyOfqZCx1yShi2MJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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