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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c818d54eac1a235205634f0aa415ed1808a2bca86ffe60e8a557aa4a1d09531' 
  AND token = 'ufMIo8R0SVojOmVU8EIF6JFql5Hn+IxH4UEdExKq5sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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