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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ef05cf571d967c409705fe160f521e4c1c48c4593b76af9d03f8f87270dc09' 
  AND token = '/I9u4mNmVzyKXzG/AvNGJUtG03lMbtncVnBTcCbRkZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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