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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e17b471cc37732dcd19a38083025cba9e32e67a64b33ff5134a66c6fc0964e' 
  AND token = 'PJIfpCrf013VnNCuF9juSFHWxDHSCy40hGa7EHqBJwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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