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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '234c1da112d3f5df4d0b2771c1fbf68fee203fd88a06ccfd3a4c9ef62b895a4b' 
  AND token = 'cOmfTyH/a0GaLswgykEWlFmNIcmonVz87LZ+4ru3s9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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