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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353ca25a4c79a746e1c506414e23c283e5df74395f46cf04887951136a54e2dd' 
  AND token = '+Q2Htgwlhkxcgbe2AsDgoKO1VFBeCHPnBae//mlxyhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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