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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2ecf599711ec8c45c29392f95eb064e48e943aa823a1bfbd5963886fc4680f' 
  AND token = 'uuypDnwkNFDYcbGDLIaO0fNL2u7v8Pn9D1r/CMywKRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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