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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1ccb671a0cf672d374f1b5c67bcb7e4fdc9355d18a05ec2547486758a1c307' 
  AND token = 'FF/yYV/6pOZ3hs0wMr2rRy4WQe7we79Bu85kBtTRqHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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