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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be70e82e6c0e88ef8d11b607ae80fe06383ee9cf64514c6fdea3795b7934e954' 
  AND token = 'pGHulRZirBAiTH/8RMCBBRdtpEiWFBKKy7rYYQouXbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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