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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7a3f23f5d505b3f5a306b5d07520cedf6ccf82f7eacbe69c1a7cb4ff67b9a0' 
  AND token = 'eFAuokDXMBAVuLVi3tA+DzPZ3wkj/xlj7WA9JQYU1lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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