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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ac1f60af3d909270914d3f13c8576d39d3f21cf9e29169bcaa13b92b78a5d5' 
  AND token = '11ofM45ml1I2HcTM5/l4kyvjZJjE93mT1IgtT9aBrUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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