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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba231b03c83aad09c10cf5399d077ec3b1d9ba57ad8f353b7b11dd8c76fb3e6' 
  AND token = '644X6pQM7gAC0S4/dCSLlGs3nvEJkglQ2ONNdbPaUmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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