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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8e3225cb20e4230918d8c55e176389c6b46aabe98d2579a0dc886cc426ffd2' 
  AND token = 'l9eplY3dU9uzc6YCocOWiJ0+kgdPLcHw9VlOHl2cL/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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