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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffea84d2c419f243ac0cd0d30139d69f53d4e887dae63553ae0f928e756c5d0' 
  AND token = 'lUttqImBNAy28kKBUQ5RDo8xtxEREGPpZI+6+bHWsJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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