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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f3a5179985c9e83a0ce050320e672f54c9178ea215f0f5883bd076ffff67ad' 
  AND token = 'vsFcj7x06TMYvz3HEtY4wNXoY78bgpyOeG/VeGcw/Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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