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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b638eb60591480fb86c4d2d40e81015be282a81b0610805d494114757f3dc61' 
  AND token = 'RRLDQlq5ZztKxCmy+iN34XkP2ygc/cg7cDKirUsq5Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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