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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce108dad923041542199c62c76d6fed3104008fbe5ee8a86b3cd20068f30db2' 
  AND token = 'Yfo3IE7+IDvUahwKJG4AHlq9FIzlIbna0LMnaUw+zgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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