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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45cafdfec6875af10cb3bbee5d8aa754fc8fc86d64223f403fc5d254b28b298c' 
  AND token = 'qG4lyxqnohrwCOe870y6bbr7kMq02shq9Cu+S0edC7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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