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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624b79a130be11de7509dab32c1798f4ec67e757fca0ec83ca8d43391a769913' 
  AND token = 'gS6cJbjhA6ody5RT+mmDAzMM4R+Cln5gY+RHJJQJ568=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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