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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1e18a53216df7bc56b6046100f634d4b23e5a08b65ad861f45bcdd2da8cc10' 
  AND token = 'In7XtagXjRaRgKcpjFpQjAsaxDip0x600LGbF+o+H6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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