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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb4e9ce4f524384503b786793d22263e7a154076fcbb387590dbaeac3c0fb2b' 
  AND token = 'wTd4pP7z3oR16thlB2Sv/6hFIwIT9dWSgx4c4O5/GHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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