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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccf97a45ebbae015699e8807b55b2bba920696612bdeb827d26744a4d35c1c7' 
  AND token = 'nfvD3li6s+7kTIQch9SuE83q0y79lW2GQFl+v3Nl3HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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