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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2c5b7f88f163ba0fc43551038655313f6aa4f072f933271606f718eeb693b1' 
  AND token = 'sWtKB379w5fBl2yEv0VOMzvT7PaZ/DsGw2/fUWLZkMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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