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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd284094b7981acc7786ae643342cd6d1b702fd986cc57e75e816ae732ee8367d' 
  AND token = 'Otr5Cf0DtZBO5jn9iL77rUox/nVtb/01B/24fj2hhTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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