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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d0eebe635cf649de979eb304431543487ecdf124e76ecfa26b1ded012a19e6' 
  AND token = 'u9EY598i74+vQgxA1C9Oa6PvCom8jbiRDiG+AN1tBEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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