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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f3583fa25b9679c8e636af8e0090395aa422a49c11008506a93004ff57ac80' 
  AND token = '96b80odDviiTOf+qhVF+J2xOjbiBYrh0YADLhT73+8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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