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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc4fee80c543dc4d1ae8327e584a347a72d56e0c096ea67eef9ae97b10c9b812' 
  AND token = 'i8EaWta970k+GOYkCW6GloQ8aEk0xn8B9RPwjaJONbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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