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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4296a2bfee6a1d2fc169efd3a48242448a66aa8c179a1069053012d50ce7bfd2' 
  AND token = 'jzZ2wxG7J6PjCGAl4B7VYUHb14DsVXLNwku/1ee6PtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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