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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa202e498558a0e71e8f3f84191071308fee6687c563828d199e9d47aaf8298' 
  AND token = 'o/nkB8X3DmYNihoDpWeefvwudko2/aLGWgXzz/0jTmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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