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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9753fc6440905cd7716dd20be5596e818409667f7fc1004a44d4cc62ebbe27' 
  AND token = 'EmU3r21yivHPAQbHsYDW3Be8biweSnwoYETj9ra0/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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