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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d507225a1fea7ab62445a25369e3ff228ee6fb798ccd57ab66c34699a7c79c' 
  AND token = '5vj+EbSF/VPtjiZvPWrBeMhlgiaiZaZ2a2eTxo9Klxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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