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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afde4d161ead1b1bddecb2d1cd1c6c1b791968df71ce1b5fbcf414ddc663ef9' 
  AND token = 'gdyOcQgIN5Wq+TInJOewToNAOSRWOFl5oe4ATSj1Qgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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