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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d625d3cc9d3995262362b2c107672bcd836cc676b800f467bcb5b426cbe028' 
  AND token = 'nG8p/i4wOkqSgMWmHl1dlDMkwfz9HHq1QKUXyrbpvHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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