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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91ca0a03508a65cd40b4b7cccac12f9fe0812bd74c5ba86ddef00098f8ed262' 
  AND token = 'sxQo/ag74a2m5f+YK9BBh6L7UGeLw97p0G7iLU6/aYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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