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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28b7d4151ba54b4bdb60e4d36aab7ef4f64b167a939f4b7e32d222fbe013e55' 
  AND token = 'gpTAhybB+nrDPHLVTrLJ5+d1+rEnzpNulSmySWiOJbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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