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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01274ddbdabddf4de34a258effe9ca9d0a6b9f9adfe1fcbc5b66c5bd3693a84' 
  AND token = '+ZMj0+f/cckakp3DoK+rCoT0OX69dXP83U+RoYrN49s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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