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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723dc3e96cc1c2eb511b6570c5ca9b2e93df711fbdbd3ade01b379598370f609' 
  AND token = 'qfLS/cMga0e1EWlCFYluUUG8I1oyTMszKvLHo3UbxBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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