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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f09957beeec1fe3618e0bd3c7c47f3c84ac51c87400dbf6107fbb9974560a71' 
  AND token = 'rujBSq+6Xi8YcNpz/06XSqH/b43cOhjj3RQ05jI2iRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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