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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4a3248fefd3f314c0950a356e43a2275a4cf9cd9286a3eb43cef1e115625eb' 
  AND token = '1kcxNKNfjg3dUThLRDoM/jeVJlOkNBRZ4LahjF/FIc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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