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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6436499dcadc411609e2118b7243077852c400d0f244aeff5d7d15f6b5dbf36' 
  AND token = 'yuXKcizSizutQP1+E41UnvwsdsOFLdtFj4++2IWJirE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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