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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a11c4cc55fb54e79920eed65c62aa4a975af354d19402285cfca0874e02aa6e' 
  AND token = 'tWgGX5lQ1Xk2yMWiujd5YS4gkdGQdE8N+CV68ruC3fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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