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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f895454a31a9e57198f54322066ce7219bd99e3a9a20e39313cd524e6cbc32' 
  AND token = 'NHNCCs3FSkGDM+1rQf4D+K8Foy3tu5WrTI3hYPQH1Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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