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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415b4da8436f8e2f12cd82cf58b4009e457cf1d2359bbb23e83d3bd7831f38d3' 
  AND token = '9RhcH64MW9x8RWT/LprdFMKY0b+FU5wjBxLl6kIXJJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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