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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca68c0b92755dc82a767f40c4013590f22df6a7ae9c115fa1b39577b9b8b5d42' 
  AND token = 'CPjerDToFP6FzhM9RY7YNLSLQeNQjCO6K1c1FafGeFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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