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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b00e82db6e5c3077ddb243f5ae3f35ef0b6b9138d59047fdb3441ffee6c9a4' 
  AND token = '+0KdCwoRG6453oJHaveZdAc+2iD2TF5O469ZdGypGZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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