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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbcaa6ac2e2c1dc97149b727798a8c30285b28606a4258f2ffc99084992dc7f' 
  AND token = 'BXwkajs+iYewLP7I/BrQlQ9zfaLpYmn529d5pJvczZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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